树莓派蜂鸣器连接图

树莓派蜂鸣器连接图如下：

        +-----+-----+---------+------+---+ Model B+ ---+------+---------+-----+-----+
        | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
        +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
        |     |     |    3.3v |      |   |  1 || 2  |   |      | 5v      |     |     |
        |   2 |   8 |   SDA.1 |   IN | 1 |  3 || 4  |   |      | 5V      |     |     |
        |     |     |    GND  |      |   |  5 || 6  |   |      | 0v      |     |     |
        |   3 |   9 |   SCL.1 |  OUT | 1 |  7 || 8  | 1 | OUT  | TxD     |     |     |
        |     |     |    GND  |      |   |  9 || 10 | 1 | OUT  | RxD     |     |     |
        |   4 |   7 | GPIO. 7 |  OUT | 1 | 11 || 12 | 1 | OUT  | GPIO. 1 | 1   | 17  |
        |     |     |    GND  |      |   | 13 || 14 |   |      | 0v      |     |     |
        |   5 |  21 | GPIO.21 |  OUT | 0 | 15 || 16 | 1 | OUT  | GPIO.22 | 22  | 6   |
        |   6 |  22 | GPIO.22 |  OUT | 0 | 17 || 18 |   |      | 3.3v    |     |     |
        |   7 |  11 | GPIO.11 |  OUT | 0 | 19 || 20 |   |      | GPIO.27 | 27  | 13  |
        |     |     |    GND  |      |   | 21 || 22 |   |      | GPIO.28 | 28  | 19  |
        |   8 |  10 | GPIO.10 |  OUT | 0 | 23 || 24 | 1 | OUT  | GPIO.23 | 23  | 11  |
        |     |     |    GND  |      |   | 25 || 26 | 1 | OUT  | GPIO.24 | 24  | 9   |
        |   9 |  13 | GPIO.13 |  OUT | 0 | 27 || 28 |   |      | GPIO.29 | 29  | 5   |
        |  10 |  12 | GPIO.12 |  OUT | 0 | 29 || 30 |   |      | 0v      |     |     |
        |  11 |  14 | GPIO.14 |  OUT | 0 | 31 || 32 |   |      | GPIO.26 | 26  | 15  |
        |  12 |  15 | GPIO.15 |  OUT | 0 | 33 || 34 |   |      | 0v      |     |     |
        |  13 |  28 | GPIO.28 |   IN | 0 | 35 || 36 |   |      | GPIO.27 | 27  | 13  |
        |  14 |  29 | GPIO.29 |   IN | 0 | 37 || 38 |   |      | GPIO.28 | 28  | 19  |
        |     |     |    GND  |      |   | 39 || 40 |   |      | GPIO.30 | 30  | 16  |
        +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
        | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
        +-----+-----+---------+------+---+ Model B+ ---+------+---------+-----+-----+

假设我们将蜂鸣器连接到树莓派的 GPIO4 引脚上，连接方式如下：

- 将蜂鸣器的一个引脚连接到树莓派的 GPIO4 引脚上；
- 将蜂鸣器的另一个引脚连接到树莓派的 GND 引脚上。

接线图示意图如下：

+--------------------------+
|                          |
|         Raspberry Pi     |
|                          |
| +-----+                  |
| |     |                  |
| |     |                  |
| |     |                  |
| |     |                  |
| |     |                  |
| +-----+                  |
| |     |                  |
| |     |                  |
| |     |                  |
| |     |                  |
| |     |                  |
| +-----+                  |
|  3V3  |                  |
|  GND  |                  |
|  GPIO4|----[Buzzer]------|
|  ...  |                  |
|       |                  |
+--------------------------+

注意：连接蜂鸣器时，需要注意蜂鸣器的极性，如果不正确，可能会导致蜂鸣器发不出声音。